Paper machine



R. E. A RGY PAPER MACHINE May 7, 1929.

Filed July 9, 193

I @III .1 0 QN 1 Q m I E 0 & w i/i.

m d M i @e Z @w UNITED STATES PATENT OFFICE.

ROBERT EDWARD ARGY, OF NIAGARA. FALLS, NIl'JW YORK.

PAPER MACHINE.

This invention relates to a paper machine. The object of the inventionis to-provide a paper machine in which novel provision is made forpro-heating the paper web prior to its passage through the wet pressingapparatus of the machine to the end that the paper web may be thuspre-heated with minimum attending alteration in and departure from theconstruction and arrangeto ment of existing paper machines. With thisobject in view and such others as may hereinafter appear, the inventionconsists in the paper making machine and in the combinations, structuresand arrangetu ments of parts hereinafter described and particularlydefined in the claims at the end of this specification.

In the drawing I have illustrated a sufficient portion of a paper makingmachine to an enable the features of the present invention to beunderstood,

The present invention aims to provide a novel and improved constructionof paper making machine in which novel provision is made for preheatingthe paper web prior to the time that it has completed its passagethrough the wet pressing apparatus of the machine and the constructionof which is such as to enable existing paper machines to be modified oraltered to produce the improved machine in a simple, inexpensive manner.To this end the invention contemplates the provision of a combined paperguiding and heating roll adjacent a pair of the press rolls of the wetpressing apparatus and around which the paper web is passed to bepre-heated and guided between said press rolls. In thepreferred form ofthe invention a 'pair of combined paper guiding and pre-heating rollsare substituted for the usual paper carrying rolls located between thelast wet press rolls and the usual set of driers at the end of the papermachine, so that in adapting an existing paper machine to one embodyingthe features of the pres ent invention it 1s only necessary tosubstitute such steam-heated pre-heating and guiding rolls for the usualpaper carrying rolls. Referring now to the drawing, represents the paperweb after it has been formed and as it is being conducted through thewet pressing apparatus, herein shown as comprising one set of wet pressrolls 12, 13, and a second or last set of press rolls 14:,

Application filed July 9, 1928. Serial No. 291,274.

15. The paper is conducted through the first wet press rolls whilesupported upon the usual felt indicated at 18.

Prior to the passage of the web of paper through the last set of wetpress rolls 14, 15, provision is made for conducting the paper aroundsteam heated rolls 20, 22, which are preferably of the size and arelocated at the usual places in the machine occupied by the usual papercarrying rolls and which serve in the improved paper machine as,combined pre-heating and guiding rolls for conducting the paper web to acorrect position to permit it to pass between the last set of pressrolls 14, 15. 'As herein shown, the combined paper guiding andpreheating rolls comprise hollow steel rolls connected by supply pipes26, 2'3 to-a header 28 supplied with steam from any suitable source ofsupply (not shown), and the flow of steam to each roll is controlled inany suitable manner as by valves 30, 31. As stated, in the operation ofthe machine the paper web is conducted around the lower paper guidingand pro-heating roll 20, thence around the upper of such rolls 22 andbetween the last set of Wet press rolls 14, L

After having passed between the wet press rolls 14, 15, the paper web isconducted around the usual guide roll 34 and thence to the usual set ofdriers at the end of the machine, passing over a baby drier 4:2

"as shown.

From the description thus far it will be observed that an existing papermachine may be readily and economically modified to be capable ofpro-heating the paper web prior to the time that it completes itspassage through the wet presses of the paper machine. It has been foundthat the preheating of the paper web in this manner facilitates themechanical extraction of the water from the web so that the wet pressesare enabled to extract much more water than has heretofore been possiblewith papermachines in which no pre-heating has been practiced. Thisresult is undoubtedly due to the decrease in the surface tension of thewater included within the web. As a result of the. pre-heating,economies in steam consumption in the final driers may be obtained,enabling paper to .be produced more economically and rendering possiblethe operation of the machine at increased speeds as compared withexisting prior paper machines employing no apparatus for pre-heating ofthe paper web.

It is to be understood that while it is preferred to heat the combinedpre-heating and guiding rolls with steam, nevertheless other means ofheating may be used if desired.

While the preferred embodiment of the invention has been hereinillustrated and described, it will be understood that the in vention maybe embodied in other forms within the scope of the following claims.

Having thus described the invention what is claimed is:

1. In a paper making machine, the combination with the last wet pressrolls of an upper and lower-paper carrying roll positioned between thelast press rolls and the final drier's, and means for heating one ofsaid paper carrying rolls to preheat the paper web prior to its passagethrough the last wet press rolls.

2. In a paper making machine, the combination with the last web pressrolls of an upper and lower paper carrying roll positioned between {thelast ress rolls and the final driers, and-means or heating both of saidpaper carrying rolls to pre-heat the paper web prior to its passagethrough the last wet press rolls.

3. In a paper making machine, the combination with the usual set ofdriers and the last wet press rolls of combined pa r guiding andpreheating rolls interpo between the driers and the last wet press rollsand around which the web is led prior to. its passage through the lastwet press rolls.

4. In a paper making machine, in combination, a pair of wet prew rolls,and a combined heating and guiding roll positioned adjacent the said wetpress rolls and around which the paper is passed-to be heated and to beguided between said wet press rolls.

5. In a paper making machine, in combination, a pair of wet ress rolls,a pair of 7 ROBERT EDWARD ARGY.

